<script setup lang="ts">
import { ref, computed, watch } from 'vue';

// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}
// 水果列表
const defalutfruitList = ref<Fruit[]>([
  {
    id: 1,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
    isChecked: false,
    num: 20,
    price: 34,
  },
])
const fruitList = localStorage.getItem('list')
  ? ref<Fruit[]>(JSON.parse(localStorage.getItem('list') || '[]'))
  :
  ref<Fruit[]>(defalutfruitList.value)
// 监听水果列表变化，同步到localStorage
watch(fruitList, (newVal) => {
  localStorage.setItem('list', JSON.stringify(newVal))
}, { deep: true, immediate: true })

const decrease = (id: number) => {
  const fruit = fruitList.value.find(fruit => fruit.id === id)
  fruit && fruit.num--
}
const increase = (index: number) => {
  if (fruitList.value[index].num < 10000) {
    fruitList.value[index].num++;
  }
}
const remove = (id: number) => {
  fruitList.value = fruitList.value.filter((fruit) => fruit.id !== id);
}
const totalMoneys = () => {
  return selectFruit.value.reduce((sum, fruit) => sum + fruit.num * fruit.price, 0)
}
const totalSum = () => {
  return selectFruit.value.reduce((sum, fruit) => sum + fruit.num, 0)
}
const selectFruit = computed(() => {
  return fruitList.value.filter(fruit => fruit.isChecked)
})
const allChecked = computed({
  get() {
    return fruitList.value.every(fruit => fruit.isChecked)
  }, set(value) {
    fruitList.value.forEach(fruit => fruit.isChecked = value)
  }
})

</script>
<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr active" v-for="(fruit, index) in fruitList" :key="fruit.id">
            <div class="td"><input type="checkbox" v-model="fruit.isChecked" /></div>
            <div class="td"><img :src="fruit.icon" alt="" /></div>
            <div class="td">¥{{ fruit.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" v-on:click="decrease(fruit.id)" :disabled="fruit.num <= 1"> - </button>
                <span class="my-input__inner">{{ fruit.num }}</span>
                <button class="increase" v-on:click="increase(index)"> + </button>
              </div>
            </div>
            <div class="td">¥{{ fruit.num * fruit.price }}</div>
            <div class="td"><button v-on:click="remove(fruit.id)">删除</button></div>
          </div>

        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="allChecked" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalMoneys()
              }}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalSum() }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>